I'm not sure what the output of this command looks like, or what version of IOS you're running. However, a ubr7200 running ubr7200-jk9su2-mz.122-33.SCB supports the following cable-related MIBs:
CISCO-CABLE-ADMISSION-CTRL-MIB
CISCO-CABLE-AVAILABILITY-MIB
CISCO-CABLE-METERING-MIB
CISCO-CABLE-QOS-MONITOR-MIB
CISCO-CABLE-SPECTRUM-MIB
CISCO-DOCS-EXT-MIB
CISCO-DOCS-QOS-EXT-MIB
CISCO-DOCS-REMOTE-QUERY-MIB
DOCS-BPI-MIB
DOCS-BPI-PLUS-MIB
DOCS-CABLE-DEVICE-MIB
DOCS-CABLE-DEVICE-TRAP-MIB
DOCS-DRF-MIB
DOCS-DSG-IF-MIB
DOCS-IETF-CABLE-DEVICE-NOTIFICATION-MIB
DOCS-IF-EXT-MIB
DOCS-IF-MIB
DOCS-IFEXT2-MIB
DOCS-L2VPN-MIB
DOCS-LOADBAL3-MIB
DOCS-LOADBALANCING-MIB
DOCS-QOS-MIB
DOCS-SUBMGT-MIB
DOCS-TEST-MIB
There MIBs can be downloaded from ftp://ftp.cisco.com/pub/mibs/v2/ . Perhaps one or more of them can provide you the data you need.